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OPTION 2:
Maximum Equivalent Vent Length Tables:
Determine the number of 90 degree elbows in the vent system. (two 45 degree elbows count as one 90 degree elbow.)
Refer to the tables below to find the maximum vent length based on the number of elbows and terminatio style.
Total Equivalent Vent Length (Intake/outlet) for Twin Pipe 3" PVC/CPVC
Maximum Vent Length
Terminati n Type
Terminati n Equivalent Length in feet
(meters) (Already factored into the straight
pipe lengths below)
# of 90° Elbows (each: 5 equivalent feet)
0
1
2
3
4
5
6
Total Equivalent Vent Length (Intake/outlet) for Twin Pipe 4" PVC/CPVC
Maximum Vent Length
Terminati n Type
Terminati n Equivalent Length in feet
(meters) (Already factored into the straight
pipe lengths below)
# of 90° Elbows (each: 5 equivalent feet)
0
1
2
3
4
5
6
**SW 1 in DIPSW 1 is "OFF" for lengths greater than or equal to 21 feet
Maximum vent lengths are specifi to the fuel type of the tankless water heater. It is imperati e when
performing equivalent vent length calcula ons that the gas type be taken into considerati n.
24
Natural Gas Units
65 Feet
IPEX or Royal
Snorkel
Concentric Vent
Terminati n
Kit
20 (6.1)
15 (3.0)
Max. straight pipe vent length in feet (meters)
45 (13.7) **
50 (15.2) **
40 (12.2) **
45 (13.7) **
35 (10.7) **
40 (12.2) **
30 (9.1) **
35 (10.7) **
25 (7.6) **
30 (9.1) **
20 (6.1) **
25 (7.6) **
15 (4.6) **
20 (6.1) **
Natural Gas Units
100 Feet
IPEX Concentric
Snorkel
Vent Kit
Terminati n
20 (6.1)
15 (3.0)
Max. straight pipe vent length in feet (meters)
80 (24.4) **
85 (25.9) **
75 (22.9) **
80 (24.4) **
70 (21.3) **
75 (22.9) **
65 (19.8) **
70 (21.3) **
60 (18.3) **
65 (19.8) **
55 (16.8) **
60 (18.3) **
50 (15.2) **
55 (16.8) **
ATTENTION
KBP Series Manual
IPEX or Royal
Side Wall Tee
Low Profi e
Terminati n
Terminati n
5 (1.5)
5 (1.5)
60 (18.3) **
60 (18.3) **
55 (16.8) **
55 (16.8) **
50 (15.2) **
50 (15.2) **
45 (13.7) **
45 (13.7) **
40 (12.2) **
40 (12.2) **
35 (10.7) **
35 (10.7) **
30 (9.1) **
30 (9.1) **
Side Wall Tee
Low Profi e
Terminati n
Terminati n
5 (1.5)
5 (1.5)
95 (29.0) **
95 (29.0) **
90 (27.4) **
90 (27.4) **
85 (25.9) **
85 (25.9) **
80 (24.4) **
80 (24.4) **
75 (22.9) **
75 (22.9) **
70 (21.3) **
70 (21.3) **
65 (19.8) **
65 (19.8) **
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